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author | Goldwyn Rodrigues <rgoldwyn@suse.com> | 2020-05-19 09:14:18 -0500 |
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committer | David Sterba <dsterba@suse.com> | 2020-05-28 14:01:02 +0200 |
commit | a43a67a2d715540c1368b9501a22b0373b5874c0 (patch) | |
tree | 207099d2eb65c799e1352efaf3b4e02c462f2339 /fs/direct-io.c | |
parent | 3ad99bec6e82e32fa9faf2f84e74b134586b46f7 (diff) | |
download | linux-next-a43a67a2d715540c1368b9501a22b0373b5874c0.tar.gz |
btrfs: switch to iomap_dio_rw() for dio
Switch from __blockdev_direct_IO() to iomap_dio_rw().
Rename btrfs_get_blocks_direct() to btrfs_dio_iomap_begin() and use it
as iomap_begin() for iomap direct I/O functions. This function
allocates and locks all the blocks required for the I/O.
btrfs_submit_direct() is used as the submit_io() hook for direct I/O
ops.
Since we need direct I/O reads to go through iomap_dio_rw(), we change
file_operations.read_iter() to a btrfs_file_read_iter() which calls
btrfs_direct_IO() for direct reads and falls back to
generic_file_buffered_read() for incomplete reads and buffered reads.
We don't need address_space.direct_IO() anymore so set it to noop.
Similarly, we don't need flags used in __blockdev_direct_IO(). iomap is
capable of direct I/O reads from a hole, so we don't need to return
-ENOENT.
BTRFS direct I/O is now done under i_rwsem, shared in case of reads and
exclusive in case of writes. This guards against simultaneous truncates.
Use iomap->iomap_end() to check for failed or incomplete direct I/O:
- for writes, call __endio_write_update_ordered()
- for reads, unlock extents
btrfs_dio_data is now hooked in iomap->private and not
current->journal_info. It carries the reservation variable and the
amount of data submitted, so we can calculate the amount of data to call
__endio_write_update_ordered in case of an error.
This patch removes last use of struct buffer_head from btrfs.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/direct-io.c')
0 files changed, 0 insertions, 0 deletions